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rev 2.0 ?2010 advanced linear devices, inc. 415 tasman drive, sunnyvale, ca 94089-1706 tel: (408) 747-1155 fax: (408) 747-1286 www.aldinc.com ultra low vos epad ? dual cmos analog voltage comparator ald2321a/ald2321b/ald2321 a dvanced l inear d evices, i nc. pin configuration applications ? dual limit window comparator ? power supply voltage monitor ? photo-detector sensor circuit ? relay or led driver ? oscillators ? battery operated instruments ? remote signal detection general description the ald2321a/ald2321b/ald2321 is a monolithic precision dual volt- age comparator, each having integrated dual complementary output drivers. it is constructed using advanced silicon gate cmos technology. key features of the ald2321a/ald2321b/ald2321 include very high input impedance, very low offset voltage utilizing on-chip e-trim (epad ? electronic-trimming) technology, flexible multiple output configurations and fast response time with small overdrive voltage. it is designed for ultra low level signal detection from high impedance sources. for many applications the ald2321a/ald2321b/ald2321 can eliminate an input amplification stage, a precision input bias stage, a signal level shift stage and an output buffer stage, and do the entire job from low level input signal detection to high output driver -- all on a single chip. the input voltage includes ground, making this voltage comparator ideal for single supply (+5v) or dual supply ( 5v) powered systems. for dual supply applications, gnd pin is connected to the most negative supply instead of ground (0.0v). the negative supply voltage can be at any value between 0.0v and -5v. each voltage comparator is individually trimmed at the factory for minimum offset voltage at ground voltage potential, making the ald2321a/ ald2321b/ald2321 at its best offset voltage and ready to compare very low signal level voltages at or near ground potential. typically a signal less than 1mv can be resolved and detected reliably without requiring amplifica- tion. sensor or detector signals with signal power as low as 0.004pw (4 x 10 -15 watt) can be readily detected. each voltage comparator has two complementary output pins, one for source output (out h ) and the other for sink output (out). this dual complementary output allows maximum circuit design flexibility. the out- puts can be used as single-ended driver, multiple wired-or outputs, push-pull outputs or complementary outputs. the sink output can be used as an open drain output, which has current sink capability of up to 50ma. it can also be connected to an external voltage higher or lower than v+, which provide level shift of the output swing levels from other than v+ to gnd. the source output can source up to 2ma and can be used to drive the base terminal of an external npn bipolar device or the gate of a n- channel mosfet device. alternatively, the two outputs, source output and features ? ultra low signal power of 4fw detectable ? ultra low offset voltage of max. 0.2mv ? ultra low input bias currents of typ. 0.01pa ? low supply current of 110 a typical ? virtually eliminates source impedance effects ? low operating supply voltage of 4v to 10v ? single (+5v) and dual supply ( 5v) operation ? high speed for both small and large level signals 300ns typical for ttl inputs ? cmos, nmos and ttl compatible ? each comparator has separate push and pull outputs ? high output sink current - typically 50ma ? low supply current spikes ? fanout of 30 ttl loads v + 1 2 3 14 15 16 4 13 5 12 n/c * 6 7 8 10 11 out 1h -in 1 out 1 ve 11 n/c * ve 12 9 ve 22 ve 21 out 2h out 2 -in 2 +in 2 +in 1 gnd operating temperature range * 0 c to +70 c0 c to +70 c -55 c to +125 c 16-pin 16-pin 16-pin small outline plastic dip cerdip package (soic) package package ald2321ascl ald2321apcl ald2321adc ald2321bscl ald2321bpcl ald2321bdc ald2321scl ALD2321PCL ald2321dc ordering information (?l? suffix for lead free version) * contact factory for leaded (non-rohs) or high temperature versions. scl, pcl, dc packages *n/c pins are connected internally. do not connect externally.
ald2321a/ald2321b/ald2321 advanced linear devices 2 of 11 sink output, can be connected together to form a push-pull output which has the combined output capabilities of both channels. in the dual complementary output mode, each comparator can be used to drive separate loads. due to the complementary nature of the two outputs, only one output is active at any a given time, except for a limited crossover time. when out (sink output) is active on, the out pin is sinking current and the out h pin is off and in high impedance mode. conversely, if out h pin is on and sourcing current, out pin is off. to configure push-pull output, simply connect out (sink output) pin to out h pin. since each voltage comparator has its own complementary out- puts, each comparator can be configured to have a different output type. for example, one comparator output can be connected as open drain output while the other comparator can be wired as push-pull output. if used to drive capacitive loads, the output dc current levels are at a very low level, at essentially leakage current levels, which can be a power saving feature. the ald2321a/ald2321b/ald2321 can detect and resolve very low voltage levels at high speed, with little or no overdrive voltage. compared with other voltage comparator devices that require 100 mv overdrive voltages, or multiple stage circuits that include input preamp, etc., the ald2321a/ald2321b/ald2321 can perform all input to output functions in one device with minimal delay time and with as low as a 1mv signal. the ald2321a/ald2321b/ald2321 is supplied with 4 external e- trim pins, ve11, ve12, ve21, and ve22. these pins are used for trimming of the voltage comparator offset voltages at the factory, and normally should be left open unconnected. however, in some cases these pins can be used as positive/negative feedback pins, since these pins have a positive/negative factor on the offset voltage. for example, see typical applications section titled "voltage comparator with output feedback to provide hysteresis." general description (cont'd) in a printed circuit board layout, it is suggested that these pins, along with no connect (n/c) pins 8 and 9, be surrounded with ground traces to prevent any possible crosstalk and noise coupling from other signal sources. although not required for most applications, if neces- sary, small valued capacitors of approximately 1000pf can be mounted at these pins to ground to further reduce noise. for information on customized trimming under different biasing and power supply conditions, please contact factory. 1 out 1 comparator 1 sink output output 2 out 1h comparator 1 source output output 3 -in 1 comparator 1 inverting input input 4 +in 1 comparator 1 non-inverting input input 5 gnd ground / v- supply - 6ve 11 - vos e-trim comparator 1 input 7ve 12 + vos e-trim comparator 1 input 8 n/c no connect/do not connect externally - 9 n/c no connect/do not connect externally - 10 ve 22 +vos e-trim comparator 2 input 11 ve 21 - vos e-trim comparator 2 input 12 +in 2 comparator 2 non-inverting input input 13 -in 2 comparator 2 inverting input input 14 out 2h comparator 2 source output output 15 out 2 comparator 2 sink output output 16 v+ v+ supply - ald2321 pin identification pin # symbol function signal propagation block diagram (1) out 1 noninverting input +in 1 (4) inverting input -in 1 (3) (16) v + (2) out 1h ve 11 gnd (6) (7) ve 12 (5) (15) out 2 ve 21 inverting input -in 2 (13) (14) out 2h ve 22 (11) (10) n/c (8) (9) n/c noninverting input +in 2 (12) - + - +
ald2321a/ald2321b/ald2321 advanced linear devices 3 of 11 supply v s 2 5 2 5 2 5 v dual supply voltage v + 4 10 4 10 4 10 v single supply supply current i s 110 180 110 180 110 180 a no load current two comparators voltage gain a vd 50 150 50 150 50 150 v/mv r load 15k input offset voltage v os 0.05 0.2 0.2 0.5 0.5 1.0 mv r load 1.5k ? input offset current 1 i os 0.01 20 0.01 20 0.01 20 pa input bias current 1 i b 0.01 20 0.01 20 0.01 20 pa common mode input v icr -0.3 v + -1.5 -0.3 v + -1.5 -0.3 v + -1.5 v voltage range 2 low level sink v ol 0.15 0.4 0.15 0.4 0.15 0.4 v i sink = 12ma output voltage v input = 1v differential low level sink i ol 24 50 24 50 24 50 ma v ol = 1.0 v output current sink output on high level source v oh 3.5 4.5 3.5 4.5 3.5 4.5 v i source = -2ma output voltage source output on source output i hl 0.01 1 0.01 1 0.01 1 na v oh = 0.0v leakage current source output off sink output i l 0.01 20 0.01 20 0.01 20 na v out = 5.0 v leakage current sink output off response time 2 t rp 1.1 1.1 1.1 s r l = 5.1k ? , c l = 15pf 5mv input step/ 0mv overdrive t rp 2.4 2.4 2.4 s r l = 5.1k ? ,c l =15pf 1mvinput step/ 0mv overdrive common mode cmrr 80 80 80 db v input = 0v to 2.5v rejection ratio power supply psrr 75 75 75 db v + = 4v to 5v rejection ratio change of vos / vexx ? v os 5 5 5 mv/v v e pins no load ? v e operating electrical characteristics t a = 25 c v + = +5v unless otherwise specified 2321a 2321b 2321 parameter symbol min typ max min typ max min typ max unit test conditions notes: 1 consists of junction leakage currents 2 sample test parameter absolute maximum ratings supply voltage, v + +10.6v differential input voltage range -0.3v to v + +0.3v power dissipation 600 mw operating temperature range pcl, scl packages 0 c to +70 c dc package -55 c to +125 c storage temperature range -65 c to +150 c lead temperature, 10 seconds +260 c
ald2321a/ald2321b/ald2321 advanced linear devices 4 of 11 typical performance characteristics supply current vs.temperature supply current ( a) ambient temperature ( c) -55 -25 0 25 50 125 100 75 160 140 120 100 60 80 180 200 v + = +5v no load two comparators supply current vs. supply voltage 012 200 supply voltage (v) supply current ( a) 0 10 8 6 24 20 40 60 80 100 120 140 160 180 no load two comparators t a = 25 0 c t a = 125 0 c t a = -55 0 c -55 -25 0 25 50 75 100 125 0 1 10 100 1000 v + = +5v input bias current vs. temperature ambient temperature ( 0 c) input bias current (pa) low level output voltage vs. temperature 0.5 0.4 0.3 0.2 0.1 0.0 low level output voltage (v) ambient temperature ( c) -55 -25 0 25 50 125 100 75 v + = +3.5v v + = +5v v + = +10v i sink = 12ma v input = 1v differential saturation voltage vs. sink current output sink current (ma) 0 15 30 45 60 75 output saturation voltage (v) 3.0 2.0 1.0 0.0 2.5 1.5 0.5 v + = +5v t a = 125 0 c t a = -55 0 c t a = 85 0 c t a = 25 0 c t a = -25 0 c high level output voltage vs. high level output leakage current 34567891011 0.0 0.1 1.0 10.0 100.0 v oh = v + high level output current (na) high level output voltage (v) t a = 125 0 c t a = 85 0 c t a = 25 0 c
ald2321a/ald2321b/ald2321 advanced linear devices 5 of 11 common mode rejection ratio vs. temperature common mode rejection mode (db) -55 -25 0 25 50 125 100 75 85.0 80.0 75.0 70.0 90.0 65.0 60.0 ambient temperature ( c) v + = +5v r l = 5.1k ? power supply rejection ratio vs.temperature ambient temperature ( 0 c) -55 -25 0 25 50 100 125 75 90.0 85.0 70.0 power supply rejection ratio (db) 80.0 75.0 65.0 60.0 v + = +5v r l = 5.1k ? high level output voltage vs. temperature 8.0 6.0 4.0 0.0 high level output votage (v) ambient temperature ( c) -55 -25 0 25 50 125 100 75 2.0 10.0 v + = +10v v + = +5v v + = +4v i oh = -2ma input offset voltage vs. temperature 0.4 0.0 -0.4 0.8 -0.8 -1.2 1.2 -2.0 input offset voltage (mv) -55 -25 0 25 50 125 100 75 ambient temperature ( c) -1.6 2.0 1.6 r l = 5.1k ? v + = +5v v + = +2.5v response time for various input overdrives output voltage (v) -1.0 6.0 2.0 0.0 1.0 3.0 4.0 5.0 0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 time ( s) t a = 25 0 c v + = +5v 1mv 2mv 5mv 10mv 20mv 50mv r l = 5.1k ? c l = 15pf input step 0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 -1.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 response time for various input overdrives output voltage (v) time ( s) 50mv 20mv 10mv 5mv 2mv 1mv v + = +5v r l = 5.1k ? input step c l = 15pf t a = 25 0 c typical performance characteristics (cont'd)
ald2321a/ald2321b/ald2321 advanced linear devices 6 of 11 voltage comparator with +/-5v supply and +5v relay drive precision single supply voltage comparator with direct relay driver 6 8 10 12 4 2 supply voltage (v) output high voltage vs. supply voltage output high voltage from v + (v) t a = 25 c i oh = -2ma v + -0.6 v + -0.1 v + -0.2 v + -0.3 v + -0.4 v + -0.5 v + 6 8 10 12 4 2 supply voltage (v) output low voltage vs. supply voltage output low voltage (v) t a = 25 c i ol = 12ma 0.0 0.2 0.4 0.5 0.6 0.1 0.3 transfer function differential input voltage (mv) +6.0 -6.0 0.0 output voltage (v) +2.5 0.0 -2.5 t a = 25 c v s = 6v common - mode voltage referred to supply voltage temperature ( c) 0.5 v+ -0.5 -1.0 0.5 v- -0.5 common - mode voltage limits (v) -55 -25 0 25 50 125 100 75 v s = 2.5 v typical applications +5 5v relay + - +5 v in v r + - 5v relay -5 +5 v in + 1k v in - typical performance characteristics (cont'd)
ald2321a/ald2321b/ald2321 advanced linear devices 7 of 11 voltage comparator with output level shift and high current load driver voltage comparator with complementary output drivers voltage comparator with +/-5v supply and output level shift voltage comparator with output feedback to provide hystersis voltage comparator with complementary outputs + - +5v v a = 0v to +10v +10v 0 v out v in + v in - v out voltage comparator with single supply and output level shift v out v r v in 2.2m out h v e22 +5v +5v r load out + - 15k -5v +5v v out 15k 100k 100k 0.1 f 0.1 f +5v 0 v out +5v v in + v in - +5v out h + - +5v r load1 =200 ? -5v v a = 1v to +30v r load2 =1k 2n2222 15k + - -5v +5v r 2 =50 200 ? +5v r 1 = 15k r load v out v in + v in - 0.066v -4v v out - - + + q q v in v ref v + 1/2 ald2321 1/2 ald2321 typical applications (cont'd)
ald2321a/ald2321b/ald2321 advanced linear devices 8 of 11 pins out 1, out 1h, out 2, out 2h, internal circuit configurations response time measurement circuit e-trim circuit + out out h input offset trim circuit level shift/ scaling ve 1x * input offset trim circuit level shift/ scaling ve 2x * +in -in - response time is defined as the internal between the application of an input step function and the instant when the output reaches 50% of its maximum value as measured by the following test circuit: v+ v limit2 photo- detector light - - + + led buzzer v limit 1 v external 1/2 ald2321 1/2 ald2321 led turns on as photo-detector voltage reaches v limit 1. both led and horn turns on as photo- detector voltage reachesv limit 2. v external = +12v, v+ = +5v dual limit photo detector montor dual limit window compartor + + - - 1/2 ald2321 output high for v in v ref(low) v out v + v ref(high) 1/2 ald2321 v ref(low) r load v in * these pins should be isolated by surrounding them with ground trace in user's applications. out 1 v + out 1h out 1 out 2 v + out 2h out 2 + - 5.1k ? out +5v 10x input step 1k ? 9k ? v in typical applications (cont'd)
ald2321a/ald2321b/ald2321 advanced linear devices 9 of 11 16 pin plastic soic package e d e a a 1 b s (45 ) l c h s (45 ) ? millimeters inches min max min max dim 1.75 0.25 0.45 0.25 10.00 4.05 6.30 0.937 8 0.50 0.053 0.004 0.014 0.007 0.385 0.140 0.224 0.024 0 0.010 0.069 0.010 0.018 0.010 0.394 0.160 0.248 0.037 8 0.020 1.27 bsc 0.050 bsc 1.35 0.10 0.35 0.18 9.80 3.50 5.70 0.60 0 0.25 a a 1 b c d-16 e e h l s ? soic-16 package drawing
ald2321a/ald2321b/ald2321 advanced linear devices 10 of 11 16 pin plastic dip package millimeters inches min max min max dim a a 1 a 2 b b 1 c d-16 e e 1 e e 1 l s-16 ? 3.81 0.38 1.27 0.89 0.38 0.20 18.93 5.59 7.62 2.29 7.37 2.79 0.38 0 5.08 1.27 2.03 1.65 0.51 0.30 21.33 7.11 8.26 2.79 7.87 3.81 1.52 15 0.105 0.015 0.050 0.035 0.015 0.008 0.745 0.220 0.300 0.090 0.290 0.110 0.015 0 0.200 0.050 0.080 0.065 0.020 0.012 0.840 0.280 0.325 0.110 0.310 0.150 0.060 15 pdip-16 package drawing b 1 d s b e a 2 a 1 a l e e 1 c e 1 ?
ald2321a/ald2321b/ald2321 advanced linear devices 11 of 11 e e 1 a a 1 b b 1 c d-16 e e 1 e e 1 l l 1 l 2 s ? 3.55 1.27 0.97 0.36 0.20 -- 5.59 7.73 3.81 3.18 0.38 -- 0 5.08 2.16 1.65 0.58 0.38 21.34 7.87 8.26 5.08 -- 1.78 2.49 15 millimeters inches min max min max dim 0.140 0.050 0.038 0.014 0.008 -- 0.220 0.290 0.150 0.125 0.015 -- 0 0.200 0.085 0.065 0.023 0.015 0.840 0.310 0.325 0.200 -- 0.070 0.098 15 2.54 bsc 7.62 bsc 0.100 bsc 0.300 bsc d s b 1 e b l a l 2 a 1 l 1 c e 1 ? 16 pin cerdip package cerdip-16 package drawing

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